Pakistan, Aug. 11 -- The first - and only - person to break the sound barrier in a car hits the track in Utah this week with new wheels and his eye on another record.

Twenty years ago, British driver Andy Green set the land speed record for a diesel-powered car, reaching 350.092 mph (563.4 kph) at Utah's famous Bonneville Salt Flats. Green will return to the lunarlike landscape Tuesday and try to beat that mark, this time with a hydrogen-powered car.

The retired Royal Air Force fighter pilot aims not only to win another accolade but to showcase the power of hydrogen as a clean-energy alternative. It's the "fuel of the future," Green told The Associated Press in a July interview. Green will be driving the 32-foot (9.75-meter) JCB Hydroma...